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Keywords: borehole
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1166
... ABSTRACT: A new method for sleeve fracturing directly measures the strain of the borehole wall by leveraging high-definition fiber optic sensing (HD-FOS) in a helically wound optical fiber integrated in an inflatable packer. This paper presents results of a field demonstration where...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1119
... ABSTRACT: A reliable computational tool is essential for the design, prediction and interpretation of dynamic stimulation jobs. In this work we present a DEM-continuum mechanics modeling approach to simulate dynamic stimulation inside boreholes using a standalone DEM-based micromechanics model...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1043
.... Theoretical analysis of a circular borehole deformation in elastic media indicates that the deformation modulus is equivalent to the Young's modulus in plane strain condition. A numerical simulator is constructed to simulate loading-unloading process during PMT test. The simulator is applied to simulate PMT...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1631
... ABSTRACT: Openhole instability during drilling and production remains a serious problem in oil and gas industry. Previous research has almost exclusively focused on the stability of a circular borehole. It is well known that drilling operations and/or rock failure can often result...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1632
... ABSTRACT: Rockbolts/rock anchors are one of primary reinforcement/support members and utilized widely in both civil engineering and mining engineering. They are generally fixed into rock mass through boreholes utilizing cement or resin-based bonding material. Therefore, their bonding strength...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1895
... as ‘petrothermal’ or ‘hot dry rock geothermal’ energy. shear zone experiment hydraulic stimulation fault zone circulation experiment bedretto underground laboratory granite reservoir foliation renewable energy borehole brittle fault zone fracture rotondo granite stimulation geoenergy ductile...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1928
... ABSTRACT: Three candidate sites for a deep geological repository are currently being explored in Northern Switzerland. The exploration program involves drilling of at least two deep boreholes per site. A very dense stress test campaign (circa 20 stress tests per borehole) is being undertaken...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1228
... the borehole expands and draws close to the center, forming a cavity with the crack penetration. The acoustic emission shows " ∞ " morphological distribution characteristics, and with the gap penetration, the acoustic emission signal forms a superposition inside the borehole, presenting a bar structure...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1359
... interrogator borehole microseismicity longwall face event location fiber section longwall microseismic monitoring fiber cable dof optic fiber longwall panel interrogator ARMA 21 1359 Microseismic monitoring of longwall caving process using distributed optic fiber sensing Luo, X. CSIRO Mineral...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1801
... injection rate. The downhole pressure is increased to the point where a fracture is initiated, and the pressure-time curve starts to deviate from the linearity. The pressure inside the borehole continues to rise to a maximum value, known as the breakdown pressure, at which point the fracture starts...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1850
... ABSTRACT: In the hydraulic fracturing method for measuring the rock stress, the maximum and minimum principal stresses and their directions in the orthogonal plane of the borehole axis can be obtained. Among these three parameters, the direction of the maximum and minimum principal stress can...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1640
... ABSTRACT: Multilayered radial boreholes can be drilled and combined with hydraulic fracturing to improve the stimulated reservoir volume. The distances between adjacent layers of radial boreholes should be optimized to ensure that a fracture cuts through all layers of radial boreholes...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1999
... in fractured and faulted rocks. A number of key factors create great uncertainties in the estimated stress field. The real fracture opening time is impossible to estimate from pressure data only (Rutqvist et al., 2000). Post-test borehole inspections often are inconclusive since no trace of reactivation...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1932
... obtained from wind, sunlight, and subsurface heat. To retrieve the latter, fluids have to be circulated through subsurface formations, accessed by boreholes. The heat carried by the circulating fluid from the deep rocks to the surface may be directly used for heating purposes or for electricity production...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2032
... has become the primary method for measuring in situ stress in boreholes beyond the length range of most overcoring methods. The American Society for Testing Materials (ASTM, 2008) and the International Society for Rock Mechanics (Haimson and Cornet, 2003)) have written protocols for performing...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2034
... job requirements to contractors, and for those contractors who are tasked with carrying out the field measurements. hydraulic fracturing hydraulic fracturing method borehole reservoir characterization well integrity test interval mpa reservoir geomechanics upstream oil & gas flow...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1724
... for the often required enhancement of hydraulic properties in deep geothermal projects. It involved stimulation and repeated hydraulic testing of ten 0.7 m-long intervals of the 63 m-long injection borehole and five local stress measurements in the vertical validation borehole (Figure 1). We applied the same...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2050
...). In Experiment 1, we drilled eight boreholes in a well-characterized phyllite and installed geophysical sensors in six of them to create a well-instrumented testbed to allow careful monitoring of stimulation events and flow tests. Numerical simulation was used to answer key experimental design questions...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1582
... leaching from sorbent within a period. In general, PVP and PFM were in good agreement on delineating the high-and low flow regions. In one borehole, which was also profiled by PVP, a downhole acoustic televiewer (ATV) survey revealed the densest set of fractures in this zone. The fracture orientation...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2064
... horizontal stress) or occasionally observing existing compressive borehole breakouts (i.e., the maximum horizontal stress) that have occurred naturally from drilling. If there are no existing compressive breakouts in a borehole, the maximum horizontal in situ stress cannot be estimated with much confidence...

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